The fact you are getting a two stage install , in an underground area , suggests that your current copper cable is direct in the ground (DIG) so no duct to the property exists , and an access ‘Toby box’ needs to be placed at the curtilage of the property ( has there been any excavation by contractors placing these toby boxes in the footpath recently ? ) , they are sited to provide the least obstacles to get to the house wall ( so placed opposite a grassed lawn area and not opposite the driveway for example) excavation is required, but it’s fairly simple if in ‘soft’ ground or only a small amount of hard surface…..if there has been no obvious recent work in the footpath etc, then you may have a ducted feed , just that the survey couldn’t verify the point at where it appears at the house ( or is visible but has been covered by landscaping etc ) in which case the address is put down as congested duct , so OR know to verify that the cable can be successfully installed before the contractual date, rather than trusting to luck , hitting a snag and failing to hit the required date.
If you check your address/phone number ( if already with BT ) the result of the survey is shown.
https://www.broadbandchecker.btwholesale.com/#/ADSL
